Ingo, I figured I would just lean on what Jos and Sebas had already put together for the formal release announcement. Probably just the first bit they wrote with a link to the full thing. The way LinkedIn works you get to post a discussion title and then a brief paragraph with more info so I will do something like this:

<snip>
Title: KDE announces the immediate availability of the KDE Software Compilation 4.4

Text:

The KDE Software Compilation 4.4, "Caikaku", has been released this morning bringing an innovative collection of applications to Free Software users. Major new technologies have been introduced including social networking and online collaboration features, a new netbook-oriented interface and infrastructural innovations such as the KAuth authentication framework. According to KDE's bug-tracking system, 7,293 bugs have been fixed and 1,433 new feature requests were implemented. The KDE community would like to thank everybody who has helped to make this release possible. Please check out http://www.kde.org for more information and then come back to LinkedIn and share your first impressions with the group!
</snip>

It's mostly their text but I did change the first sentence a bit and add in the last sentence.